I am your stereotypical Gen Y. Admittedly I'm probably a little more tech savvy and geekier than most but this is how I communicate.
I do not write letters.
This is a given. And certainly not something I need to blog about. Although an interesting side point says companies should just send my bills and statements electronically, please stop wasting paper.
I do not use a landline phone.
With a ridiculous capped plan on my mobile I have no need to use a house phone. It's a waste of money for me to pay any rental fees yet companies still insist I give them a mobile number and a home number when filling in forms. If you're a telemarketer and no ones using landlines in 20 years...

I realised today I haven't used my house phone in a while. The thick layer of dust is at least three months old.
If people want to contact me, they do it by mobile, email, social networks, MSN or most recently, Skype.
Not a good sign for telemarketers....